Ceramics International最新文献

{"title":"Designable organic-inorganic layered polyimide/alumina composite aerogels via the combining strategy of density-driven sol stratification and side-bidirectional freezing","authors":"Chen Wang,&nbsp;Yuncong Jiang,&nbsp;Yuwen Mu,&nbsp;Xin Zhou,&nbsp;Xiaodong He,&nbsp;Wenjie Li,&nbsp;Mingwei Li,&nbsp;Fei He","doi":"10.1016/j.ceramint.2026.08.129","DOIUrl":"10.1016/j.ceramint.2026.08.129","url":null,"abstract":"<div><div>Lightweight and flexible thermal insulating aerogels are critical for spacecraft thermal protection. However, conventional inorganic aerogels are intrinsically brittle, while organic counterparts generally suffer from insufficient thermal stability at elevated temperatures. Inspired by the spontaneous stratification phenomenon in layered “cocktails”, this work explored a strategy that combines density-driven solution stratification with side-bidirectional freezing to construct tri-layered polyimide/alumina composite aerogels (PACAs). A stepwise solution-based assembly method enabled the formation of stable tri-layered slurry, which was subsequently transformed into a well-defined macroscopic architecture through side-bidirectional freezing and freeze-drying. This approach yields a highly ordered lamellar microstructure with pronounced anisotropic heat transport. The cross-plane thermal conductivity of the polyimide layer reaches as low as 19 mW m⁻¹ K⁻¹, while the in-plane value is more than 4 times higher. Benefiting from the hierarchical layered design and deformation coordination between organic and inorganic components, PACA exhibits a 1.5-fold increase in elastic stress limit and a 6-fold enhancement in elastic strain limit compared with monolithic alumina aerogels. More importantly, under thermal exposure at 300 °C, 600 °C, and 900 °C for 480 s, a 25 mm-thick PACA maintains remarkably low cold-side temperatures of 34.1 °C, 40.2 °C, and 67.1 °C, respectively, demonstrating outstanding high-temperature thermal insulation. The adjustable layer thickness further enables the design flexibility of thermal management, highlighting the potential of organic-inorganic layered PACAs for advanced aerospace thermal protection.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 26","pages":"Pages 48571-48583"},"PeriodicalIF":6.0,"publicationDate":"2026-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149307033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hf4+-mediated regulation of polar nanoregion dynamics and domain evolution for enhanced piezoelectric performance in PNN–PLN–PT relaxor ferroelectrics","authors":"Yubin Li,&nbsp;Zijie Wang,&nbsp;Zhimin Li,&nbsp;Yangxi Yan,&nbsp;Ri-ichi Murakami,&nbsp;Dongyan Zhang","doi":"10.1016/j.ceramint.2026.08.132","DOIUrl":"10.1016/j.ceramint.2026.08.132","url":null,"abstract":"<div><div>Understanding the relationship among local structural response, polar nanoregion (PNR) dynamics, and domain evolution is essential for optimizing high-performance relaxor ferroelectrics, yet their underlying correlations remain insufficiently understood. In this work, Hf⁴⁺-modified PNN-PLN-PT relaxor ferroelectric ceramics were developed to investigate the relationship between local structural modulation, polarization behavior and electromechanical performance. The incorporation of Hf⁴⁺ modulates the local structural environment by enhancing lattice distortion, accompanied by changes in PNR-related relaxation behavior and enhanced polarization flexibility. The modified polar-state behavior is associated with facilitated domain responses, polarization switching, and enhanced intrinsic and extrinsic piezoelectric contributions. As a result, the optimized composition (<em>x</em> = 2.4 mol%) exhibited outstanding piezoelectric performance with a <em>d</em>₃₃ of 924 pC/N and a large-signal piezoelectric coefficient (<em>d</em>₃₃*) of 1145.5 p.m./V, together with excellent thermal stability and fatigue resistance. These findings provide insights into the correlations among local structural modification, polar-state evolution, domain behavior, and electromechanical properties, highlighting the influence of local chemical modification on the functional responses of PNN–PLN–PT relaxor ferroelectric ceramics.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 26","pages":"Pages 48600-48613"},"PeriodicalIF":6.0,"publicationDate":"2026-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149307038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ZnF2-regulated evolution of telluride borate matrix glass structure and its near-infrared luminescence properties of Er3+-doped glass","authors":"Nan An,&nbsp;Fengjie Qin,&nbsp;Dechun Zhou,&nbsp;Zhuang Leng,&nbsp;Kexuan Han","doi":"10.1016/j.ceramint.2026.08.432","DOIUrl":"10.1016/j.ceramint.2026.08.432","url":null,"abstract":"<div><div>Er³⁺-doped TeO₂–B₂O₃–ZnO–ZnF₂ glasses were successfully fabricated via a melt-quenching method combined with atmosphere control. The effect of ZnF₂ incorporation on the structural evolution and luminescence properties of telluroborate glass was systematically investigated. Raman spectral analysis reveals that the characteristic band at ∼511 cm⁻¹ gradually shifts toward lower wavenumbers as the ZnF₂ content increases from 5 to 15 mol%, indicating the transformation of [TeO₄] units into [TeO₃] units. Meanwhile, fluorine-containing structural units such as [TeO₃F] and [TeO₂F₂] are formed, which effectively optimize the local coordination environment of Er³⁺ ions and significantly reduce the OH⁻ absorption coefficient to 0.0903. X-ray photoelectron spectroscopy (XPS) analysis further confirms that [TeO₃], [TeO₄], and [TeO₃₊₁] units coexist in the glass network, with [TeO₃] dominating, suggesting the formation of a highly cross-linked network structure. Spectroscopic results demonstrate that the emission intensity at ∼1.53 μm is enhanced with increasing ZnF₂ content and reaches a maximum at 10 mol%. Based on the spectral overlap method, the spontaneous emission probability of the Er^{3+ 4}I_13/2 → ⁴I_15/2 transition is determined to be 415.68 s⁻¹, with a maximum emission cross-section of 1.65 × 10⁻²⁰cm² and a peak gain coefficient of 9.7 cm⁻¹.These results indicate that the present glass system is a promising candidate for efficient near-infrared emission at ∼1.5 μm and has great potential for optical amplification applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 26","pages":"Pages 52133-52142"},"PeriodicalIF":6.0,"publicationDate":"2026-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149306979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"NaBaLa(MoO4)3 ceramics with ultra low-loss and high performance on microwave dielectric properties for LTCC applications","authors":"Yi-Ching Pan,&nbsp;Cheng-Liang Huang","doi":"10.1016/j.ceramint.2026.08.418","DOIUrl":"10.1016/j.ceramint.2026.08.418","url":null,"abstract":"<div><div>Ultra-low-loss NaBaLa(MoO₄)₃ ceramics were synthesized using a conventional solid-state reaction method. The sintering behavior, structural characteristics, and intrinsic effects of chemical bonding on the microwave dielectric properties were systematically investigated. When sintered at 830 °C, the NaBaLa(MoO₄)₃ ceramics crystallized in a single-phase tetragonal structure with space group I41/a (88). The material achieved a high relative density of 98.5 %, a highly uniform microstructure, and excellent microwave dielectric properties: <em>ε</em>_<em>r</em> = 10.38, <em>Q</em>×<em>f</em> = 128,000 GHz, and <em>τ</em>_<em>f</em> = −58 ppm/°C. Furthermore, the Phillips–Van Vechten–Levine (P–V–L) bond theory was employed to quantitatively evaluate bond ionicity, lattice energy, and bond energy, which were subsequently correlated with the measured dielectric properties. The results indicated that the microwave dielectric performance of NaBaLa(MoO₄)₃ ceramics was strongly influenced by bond ionicity, lattice energy, and bond energy. Additionally, co-firing experiments confirmed the good chemical compatibility of NaBaLa(MoO₄)₃ with silver. An inset-feed single microstrip patch antenna operating at a center frequency of 13 GHz was also designed and simulated, further demonstrating the potential of NaBaLa(MoO₄)₃ as a high-performance substrate for LTCC and wireless communication applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 26","pages":"Pages 51956-51968"},"PeriodicalIF":6.0,"publicationDate":"2026-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149306981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced photocatalytic degradation of rose bengal using Nd3+ substituted LaFeO3 nanoparticles: Structural and functional insights","authors":"Adline Benila Stelling,&nbsp;Vethanayagam Anslin Ferby,&nbsp;Vadivel Siva,&nbsp;P. Sakthivel","doi":"10.1016/j.ceramint.2026.08.258","DOIUrl":"10.1016/j.ceramint.2026.08.258","url":null,"abstract":"<div><div>Polyvinylpyrrolidone-assisted hydrothermal method was used to synthesize the series of Neodymium (Nd³⁺) modified lanthanum ferrite (LaFeO₃) nanoparticles. The nanomaterials were then comprehensively analyzed for optical and photocatalytic performance using various advanced characterization techniques. The substitution of Nd³⁺ in LaFeO₃ perovskite lattice has remarkably reduced the band gap of the prepared materials from 2.16 to 2.10 eV, making it suitable for photocatalytic dye degradation. Porous, sponge-like network with well-developed voids was observed for LNFO3 (30% Nd³⁺ incorporated LaFeO₃ material) from morphological analysis. Photocatalytic studies demonstrated improved photocatalytic performance for Rose Bengal under the exposure of visible light for LNFO3 material, achieving 98.10% degradation efficiency within 180 min. Hydroxyl radicals were identified by scavenger analysis as the predominant reactive species involved in RB degradation. Meanwhile, reusability investigations demonstrated the material's good stability and robustness even after several cycles, proving its potential for environmental applications. These results highlight the usage of the prepared materials in advanced photocatalytic applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 26","pages":"Pages 50057-50071"},"PeriodicalIF":6.0,"publicationDate":"2026-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149306938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Removal mechanism and surface quality of SiCp/Al composites by ultrasonic elliptical vibration-assisted grinding","authors":"Zihao Zhu,&nbsp;Yunguang Zhou,&nbsp;Yuhang Wang,&nbsp;Hao Ming,&nbsp;Ming Li,&nbsp;Lianjie Ma","doi":"10.1016/j.ceramint.2026.08.094","DOIUrl":"10.1016/j.ceramint.2026.08.094","url":null,"abstract":"<div><div>SiCp/Al composites are widely used in lightweight aerospace structures because of their high specific strength, high specific modulus, and low coefficient of thermal expansion. However, the mismatch in mechanical properties between the hard, brittle SiC particles and the ductile Al matrix makes these composites susceptible to particle cracking, fragmentation, pull-out, and matrix tearing during grinding, thereby hindering improvements in machined surface quality. This study investigated the material removal mechanism and surface quality of SiCp/Al composites in two-dimensional ultrasonic elliptical vibration-assisted grinding. A kinematic model was established to analyze the effects of phase difference on abrasive-grain trajectories and motion characteristics. Finite element simulations examined the effects of phase difference, ultrasonic amplitude, and grinding depth on damage morphology and grinding force. Single-factor grinding experiments evaluated the effects of grinding wheel rotational speed, feed rate, grinding depth, and ultrasonic amplitude on surface roughness, grinding force, and surface morphology. The results show that two-dimensional ultrasonic elliptical vibration provides greater flexibility than one-dimensional ultrasonic vibration in regulating abrasive grain–workpiece contact through coupled tangential and normal motions. At a phase difference of 90°, the trajectory exhibits the most pronounced elliptical-vibration characteristics, while SiC particle damage and Al matrix tearing are relatively slight. Under this condition and appropriate process parameters, the dominant removal mode shifts from intraparticle cracking, large-scale particle fragmentation, and localized particle pull-out to a lower-damage mode dominated by micro-fragmentation and small-scale chipping in the near-surface regions and at the edges of the SiC particles, accompanied by reduced dragging and tearing of the Al matrix. Within the investigated ranges, increasing grinding wheel rotational speed and ultrasonic amplitude reduces surface roughness and surface defects, whereas increasing feed rate and grinding depth increases both. These findings provide insight into low-damage material removal and support process-parameter selection for high-quality grinding of SiCp/Al composites.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 26","pages":"Pages 48205-48224"},"PeriodicalIF":6.0,"publicationDate":"2026-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149306953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Oxidation protection of (Zr0.2Hf0.2Ta0.2Ti0.2Cr0.2)B2-MoSi2 high-entropy ceramic coating under thermal shock and wide temperature range","authors":"Peipei Wang,&nbsp;Xinxin Wang,&nbsp;Yu Chen,&nbsp;Yuhao Wu,&nbsp;Xiang Ji,&nbsp;Guozheng Lv,&nbsp;Yuhang Bai,&nbsp;Huan Luo,&nbsp;Xing Zhao,&nbsp;Peizhong Feng,&nbsp;Xuanru Ren","doi":"10.1016/j.ceramint.2026.08.111","DOIUrl":"10.1016/j.ceramint.2026.08.111","url":null,"abstract":"<div><div>To investigate the oxidation-resistant behavior of the (Zr_0.2Hf_0.2Ta_0.2Ti_0.2Cr_0.2)B₂-MoSi₂ high-entropy ceramic coating in a dynamic oxidation environment, a (Zr_0.2Hf_0.2Ta_0.2Ti_0.2Cr_0.2)B₂-MoSi₂ coating was prepared on the graphite surface by spark plasma sintering (SPS) and subjected to oxidation tests under thermal shock and wide temperature range. The results show that the final oxidation protection efficiencies of the coating are 99.9% after 1700 °C ↔ room temperature thermal-shock testing and 99.7% after wide-temperature-range oxidation from 400 °C to 1700 °C, respectively. During oxidation, the molten multiphase glass film filled and repaired pores produced by the volatilization of gaseous oxidation products. Refractory oxides were dispersed in the glass film, thereby improving the high-temperature stability of the glass film, suppressing crack propagation, and maintaining the structural integrity of the coating. Consequently, the (Zr_0.2Hf_0.2Ta_0.2Ti_0.2Cr_0.2)B₂-MoSi₂ high-entropy ceramic coating exhibited excellent oxidation resistance under both thermal shock and wide temperature range conditions.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 26","pages":"Pages 48355-48366"},"PeriodicalIF":6.0,"publicationDate":"2026-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149307143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improved high temperature oxidation resistance of TiAl alloy by pack cementation Al2O3/Ti5Si3 composite coating with sandwich structure","authors":"Shunkai Wang,&nbsp;Xiaolei Song,&nbsp;Ziteng Su,&nbsp;Ziheng Jia,&nbsp;Zhifeng Zhang,&nbsp;Zhenxin Duan,&nbsp;Rui Zhang,&nbsp;Huiliang Shao,&nbsp;Jingjing Zhang","doi":"10.1016/j.ceramint.2026.08.113","DOIUrl":"10.1016/j.ceramint.2026.08.113","url":null,"abstract":"<div><div>TiAl alloys are highly promising for aerospace applications due to their low density and high specific strength. However, their insufficient high-temperature oxidation resistance poses a significant limitation to widespread practical use. To address this, a TiAl substrate was embedded in an Al₂O₃-SiO₂ powder mixture and subjected to a diffusion-based pack cementation process at 1000 °C for 5 h under vacuum. This process produced a sandwich-structured Al₂O₃/Ti₅Si₃ composite coating, with continuous Ti₅Si₃ inner/outer layers separated by a middle Al₂O₃ layer. During cyclic oxidation at 900 °C for 100 h, the coated alloy showed a significantly lower weight gain (2.38 mg/cm²) than the uncoated alloy (10.76 mg/cm²), representing a ∼77 % reduction. The enhanced protection stems from the ability of the Ti₅Si₃ and Al₂O₃ layers to act as a dual barrier, effectively blocking inward oxygen diffusion and outward migration of Ti/Al cations. In addition, the Al₂O₃ formed by oxidation of the substrate itself further suppresses the inward diffusion of oxygen, thereby substantially improving the high-temperature oxidation resistance of the TiAl alloy.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 26","pages":"Pages 48380-48391"},"PeriodicalIF":6.0,"publicationDate":"2026-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149307145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of ZnO modification and polarization treatment on the microstructure and electrical properties of plasma-sprayed KNN ceramic coatings","authors":"Chaoming Zhang,&nbsp;Zhiguo Xing,&nbsp;Yanfei Huang,&nbsp;Xurui Feng,&nbsp;Jiajie Kang,&nbsp;Haidou Wang","doi":"10.1016/j.ceramint.2026.08.410","DOIUrl":"10.1016/j.ceramint.2026.08.410","url":null,"abstract":"<div><div>Plasma-sprayed piezoelectric ceramic coatings are attractive for structural health monitoring because they can be directly integrated onto metallic components, where both mechanical integrity and electrical response are essential for reliable sensing performance. To elucidate the combined effects of ZnO modification and polarization treatment on the microstructure, defect evolution, and electrical properties of plasma-sprayed K_0.5Na_0.5NbO₃ (KNN) ceramic coatings, pure KNN and Zn-modified KNN (ZnO-KNN) coatings were deposited on P110 steel substrates by plasma spraying and subsequently subjected to polarization treatment. The results showed that ZnO modification improved the mechanical integrity of the coatings by increasing the Young's modulus and nanohardness from 85.6 ± 4.1 GPa and 5.12 ± 0.32 GPa to 115.5 ± 4.4 GPa and 6.80 ± 0.25 GPa, respectively, while effectively reducing the residual stress. EPR analysis revealed that ZnO modification and polarization treatment regulated oxygen-vacancy-related defects, with the polarized ZnO-KNN coating exhibiting the lowest EPR signal intensity associated with these defects. The enhanced polarization response of the polarized ZnO-KNN coating with a saturated polarization (P_s) of 33.21 μC/cm² and a remanent polarization (P_r) of 27.14 μC/cm². The combined effects of ZnO modification and polarization treatment increased the dielectric constant from 357.36 to 421.78, reduced the dielectric loss from 0.067 to 0.022, and suppressed the leakage current peak. ZnO modification modified the microstructure and defect state, providing a favorable environment for subsequent domain alignment during polarization treatment, thereby improving the functional response required for piezoelectric sensing coatings.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 26","pages":"Pages 51872-51886"},"PeriodicalIF":6.0,"publicationDate":"2026-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149307096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrothermal synthesis and dielectric properties of Ba1-xCaxTiO3: Combined experimental and theoretical study","authors":"Lixin Sun,&nbsp;Hanze Mu,&nbsp;Saiwei Luan,&nbsp;Yuxin Li,&nbsp;Jie Yu","doi":"10.1016/j.ceramint.2026.08.206","DOIUrl":"10.1016/j.ceramint.2026.08.206","url":null,"abstract":"<div><div>Ultrafine ceramic powders with high tetragonality and high Curie temperature (T_c) facilitate the miniaturization and high-temperature service of high-end multilayer ceramic capacitors (MLCCs), and are thus indispensable for next-generation MLCCs. The synthesis of element-doped ultrafine single-phase barium titanate (BaTiO₃, BT) powders via hydrothermal route still faces great challenges, accompanied by unsolved issues including dopant occupancy and phase transition behavior. Here we report hydrothermally synthesized Ba_1-xCa_xTiO₃ (BCT, x = 0, 0.03, 0.06, 0.09) powders and ceramics with particle sizes of 130-170 nm and Tc values ranging from 130 °C to 144 °C. The Ba_0.94Ca_0.06TiO₃ composition achieves a maximum Tc of 144 °C, substantially higher than that of undoped BT. Temperature-dependent in situ X-ray diffraction results reveal that Ca²⁺ incorporation regulates the tetragonal-to-cubic phase transition behavior. Characterizations via spherical aberration-corrected transmission electron microscopy (ACTEM) verify the local structural modification induced by calcium ions, and X-ray photoelectron spectroscopy (XPS) tests reveal low oxygen vacancy concentration in doped samples. Moreover, combined with first-principles calculation results involving band structure, density of states, charge density difference, binding energy, and bond length, it is clarified that Ca substitution regulates the lattice configuration and local structural characteristics. Such structural modification effectively delays the ferroelectric-paraelectric phase transition of BT and consequently raises the T_c value. This research provides reliable experimental data and theoretical basis for the development of functional powders applied to miniaturized and high-temperature resistant MLCCs.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"52 26","pages":"Pages 49458-49469"},"PeriodicalIF":6.0,"publicationDate":"2026-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149307109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}